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An investigator interviewed 100 students to determine their preferences for the three drinks: milk (M), coffee(C) and tea (T). He reported the following : 10 students had all the three drinks M, C, T: 20 had M and C: 30 had C and T: 25 had M and T:12 had M only; 5 had C only: 8 had T only. Then how many did not take any of the three drinks

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answer is A.

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Detailed Solution

S = 100. The numbers can be read from the fig, number of people who did not take any drink

= 100 - {12 + 5 + 8 + 10 + 20 + 15 + 10} = 100 - 80 = 20

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